<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <title>Title</title>
    <script type="text/javascript">
    var socket;
    if(window.WebSocket){
        socket = new WebSocket("ws://localhost:7000/hello")
        socket.onmessage = function(ev){
            var rt = document.getElementById("responseText");
            rt.value = rt.value + "\n" + ev.data;
        }
        socket.onopen = function(ev){
            var rt = document.getElementById("responseText");
            rt.value = "连接开启了";
        }
        socket.onclose = function(ev){
            var rt = document.getElementById("responseText");
            rt.value = rt.value + "\n" + "连接关闭了";
        }
    }else{
        alert("浏览器不支持websocket")
    }

    function send(message){
        if(!window.socket){
            return;
        }
        if(socket.readyState == WebSocket.OPEN){
            //通过socket发送消息
            socket.send(message);
        }else{
            alert("连接没有开启");
        }
    }
    </script>
</head>
<body>


<form onsubmit="return false">
    <textarea name="message" style="height:300px;width:300px"></textarea>
    <input type="button" value="发送消息" onclick="send(this.form.message.value)">
    <textarea id="responseText" style="height:300px;width:300px"></textarea>
    <input type="button" value="清空内容" onclick="document.getElementById('responseText').value=''">
</form>
</body>
</html>